Development of a dynamic time sharing scheduled environment. Final report

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Massively parallel computers, such as the Cray T3D, have historically supported resource sharing solely with space sharing. In that method, multiple problems are solved by executing them on distinct processors. This project developed a dynamic time- and space-sharing scheduler to achieve greater interactivity and throughput than could be achieved with space-sharing alone. CRI and LLNL worked together on the design, testing, and review aspects of this project. There were separate software deliverables. CRI implemented a general purpose scheduling system as per the design specifications. LLNL ported the local gang scheduler software to the LLNL Cray T3D. In this approach, processes ... continued below

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5 p.

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Creator: Unknown. October 1, 1997.

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Description

Massively parallel computers, such as the Cray T3D, have historically supported resource sharing solely with space sharing. In that method, multiple problems are solved by executing them on distinct processors. This project developed a dynamic time- and space-sharing scheduler to achieve greater interactivity and throughput than could be achieved with space-sharing alone. CRI and LLNL worked together on the design, testing, and review aspects of this project. There were separate software deliverables. CRI implemented a general purpose scheduling system as per the design specifications. LLNL ported the local gang scheduler software to the LLNL Cray T3D. In this approach, processes are allocated simultaneously to all components of a parallel program (in a gang). Program execution is preempted as needed to provide for interactivity. Programs are also relocated to different processors as needed to efficiently pack the computer`s torus of processors. In phase one, CRI developed an interface specification after discussions with LLNL for system-level software supporting a time- and space-sharing environment on the LLNL T3D. The two parties also discussed interface specifications for external control tools (such as scheduling policy tools, system administration tools) and applications programs. CRI assumed responsibility for the writing and implementation of all the necessary system software in this phase. In phase two, CRI implemented job-rolling on the Cray T3D, a mechanism for preempting a program, saving its state to disk, and later restoring its state to memory for continued execution. LLNL ported its gang scheduler to the LLNL T3D utilizing the CRI interface implemented in phases one and two. During phase three, the functionality and effectiveness of the LLNL gang scheduler was assessed to provide input to CRI time- and space-sharing efforts. CRI will utilize this information in the development of general schedulers suitable for other sites and future architectures. All phases of this project were completed on time and all deliverables were met without significant changes to the original statement of work.

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5 p.

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OSTI as DE98006076

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  • Other Information: PBD: 1 Oct 1997

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  • Other: DE98006076
  • Report No.: LLNL--98006076
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/656743 | External Link
  • Office of Scientific & Technical Information Report Number: 656743
  • Archival Resource Key: ark:/67531/metadc707329

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  • October 1, 1997

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 16, 2016, 6:19 p.m.

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Development of a dynamic time sharing scheduled environment. Final report, report, October 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc707329/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.